Machine Design I (MCE-C 203)
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1 Machine Design I (MCE-C 203) Mechatronics Dept., Faculty of Engineering, Fayoum University Dr. Ahmed Salah Abou Taleb Lecturer, Mechanical Engineering Dept., Faculty of Engineering, Fayoum University 1
2 Aims This course is provided to give the student the knowledge to Produce a useful machine/device/product that is safe, efficient, economical, and practical to manufacture. 2
3 Design procedures. Course Outlines Factors affecting design details. Selection of materials. Modes of loading. Safety factors and allowable stresses. Design of detachable joints: ( threaded joints, keys and splines). Design of permanent joints: ( welding, interference fitting, riveting, riveting, adhesion). Design of some machine elements: springs, power screws, Thin pipes and pressure vessels, Seals and design of hydraulic and pneumatic cylinders. Application of computer aided design. Introduction to power transmission elements. 3
4 Teaching and Learning Methods Power Point Lectures. Assignments. Quizzes. 4
5 Weighting of Assessment Final Exam 60 Mid Term Exam 20 Home Work Assignment 20 Total Marks 100 5
6 Machine Design What is Machine Design? Creation of new and better machines AND Improving existing ones So that it is economical in the cost of production and operation. 6
7 Machine/device/Product Functional Marketable Safe Manufactura ble Machine/ device/ Product Reliable Usable Competitive 7
8 Design Involve all the discipline of mechanical engineering. Fluid flow, Heat transfer, Friction, Energy transport, Material selection, Statistical descriptions,., etc. 8
9 Machine/device/Product 9
10 Design Process Identify Customer Requirements. Define functions of the device. State design requirements. Define evaluation criteria. Propose several alternative design concepts. Evaluate each proposed alternative. Rate each alternative against each evaluation criteria. Select the optimum design concept. Complete detailed design of the selected concept. 10
11 The Engineering Design Process: (Core of Engineering) Problem Identification: Get with Customer. Conceptual Design: Ideas, Sketches and Solution Lists. Refinement: Computer Modeling, Data Base Development. Testing: Analysis and Simulation of All Design Aspects. Prototyping: Visualizing and Improving the Design. Communication: Engineering Drawings, Specifications. Production: Final Design, Manufacturing, Distribution. 11
12 How a design is born Machine Design Market survey Requirement marketability Aesthetic Ease of handling Creation Availability of FUNDS Safety Economical Model (Rough idea) Available material Recyclability Manufacturing resources Analysis Force/stress Material/s used Sizes 12
13 What is the basic knowledge required for Machine Design? Mathematics Engineering Mechanics Strength of of Materials Mechanics of Machines Mechanics of Materials Fluid Mechanics & Thermodynamics Workshop Processes Engineering Drawing Computing Finite Element Analysis, Computational Fluid Dynamics etc 13
14 Important considerations in Machine Design 1. Type of LOAD and STRESSes caused by the load Dead loads Live loads Steady loads Variable loads Shock loads (suddenly) Impact loads (applied with some velocity) Stress and strain (Tensile, compressive, shear) Thermal stresses Torsional stresses Bending stress 14
15 Important considerations in Machine Design.. 2. KINEMATICS of the machine (Motion of the parts) Find the simplest arrangement that would give the most efficient motion that is required. 3. Selection of MATERIALs Knowledge of the properties of the materials and their behaviour under working conditions is required. Strength, hardness, durability, flexibility, weight, resistance to heat and corrosion, electrical conductivity, machinability, etc. 15
16 Important considerations in Machine Design.. 3. Selection of MATERIALs Metal Non-metal Ferrous Non-ferrous Physical properties: Density, Melting point, Elec/thermal properties Mechanical properties: STRENGTH resist externally applied loads without breaking or yielding STIFFNESS resist deformation under stress ELASTICITY regain original shape once the force is removed PLASTICITY property which retains deformation (required for forging etc) DUCTILITY ability to be drawn into a wire by a tensile force BRITTLENESS sudden breaking with minimum distortion TOUGHNESS resist fracture due to high impact load CREEP deformation under stress and high temperature FATIGUE ability to withstand cyclic stresses HARDNESS resistance to wear, scratching, deformation, machinability etc 16
17 Important considerations in Machine Design.. 4. Form and size of the parts Use I-beam or Angle-iron? The size will be determined by the forces/torques applied (stresses on the object) and the material used such that failure (fracture or deformation) would not occur 17
18 General procedure in Machine Design.. Need or aim Recognize and specify the problem Synthesis Select the mechanism that would give the desired motion and form the basic model with a sketch etc Analysis of the FORCES Material selection Design of elements Modification Determine the stresses and thereby the sizes of components s.t. failure or deformation does not occur Modify sizes to ease construction & reduce overall cost Detailed drawing Production 18
19 Design Skills Required Technical Drawing Computer-Aided Engineering (CAE) Manufacturing Processes Statics, Dynamics, and Strengths of Materials Kinematics and Mechanisms Verbal and Written Communication 19
20 Computer Aided Engineering (CAE) Any use of the computer and software to aid in the engineering process Computer-Aided Design (CAD) Drafting, 3-D solid modeling, etc. Computer-Aided Manufacturing (CAM) CNC tool path, rapid prototyping, etc. Engineering analysis and simulation Finite element, fluid flow, dynamic analysis, motion, etc. Math solvers Spreadsheet, procedural programming language, equation solver, etc. 20
21 Acquiring Technical Information Libraries Engineering handbooks, textbooks, journals, patents. Government sources Government agencies, U.S. Patent and Trademark, National Institute for Standards and Technology, etc. Professional Societies (conferences, publications, etc.) ASME, Society of Manufacturing Engineers, Society of Automotive Engineers, etc. Commercial vendors Catalogs, technical literature, test data, etc. Internet Access to much of the above information 21
22 Design Presentation Develop a specification set that communicates effectively all manufacturing information, safety information, usage information, etc. Specifications sets include: CAD Models Drawings (Assembly, Detail, Stress Reports) Bills-of-Material Instructions: Manufacturing Assembly Maintenance Usage 22
23 The Engineering Method Recognize and understand the problem Accumulate data and verify accuracy Select the appropriate theory or principle Make necessary assumptions Solve the problem Verify and check results 23
24 Problem Presentation Problem Statement Diagram Theory Assumptions Solution steps Identify results and verify accuracy 24
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